close collision

Evaluation of the contribution fraction of close collision to the backward electron emission induced by He~+ ion;

近程碰撞对He~+离子诱发背向电子发射贡献比例的计算

Finally one near-collisions of MD4 is found.

通过对MD4算法和王小云逐比特差分分析的介绍,利用相关差分分析的理论知识,对MD4算法产生了一对近似碰撞。